// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//


// A FileHandle is a File pointer plus some (optional, file-type-dependent)
// extra information for speeding up loading columnar data. For example, when
// we open a file we might build a hash map saying what region(s) on disk
// correspond to a given column in a given stripe.
//
// The FileHandle will normally be used in conjunction with a CachedFactory
// to speed up queries that hit the same files repeatedly; see the
// FileHandleCache and FileHandleFactory.

#pragma once

#include <cstdint>

namespace kumo::pollux {

struct FileProperties {
  std::optional<int64_t> fileSize;
  std::optional<int64_t> modificationTime;
  std::optional<int64_t> readRangeHint{std::nullopt};
  std::shared_ptr<std::string> extraFileInfo{nullptr};
};

} // namespace kumo::pollux
